Early years

Heuer Fernandes' youth career included stints at VfL Bochum and Borussia Dortmund.^[5] He played for VfL Bochum II for two seasons.^[6] During the 2011–12 season, he made 14 appearances^[7] and during the 2012–13 season, he made 34 appearances.^[8]

From 3. Liga to Bundesliga

He played for VfL Osnabrück during the 2013–14 and 2014–15 seasons.^[6] During the 2013–14 season, he made 36 appearances.^[9] During the 2014–15 season, he made 26 appearances.^[10]

In July 2015, Heuer Fernandes left 3. Liga side VfL Osnabrück to join freshly relegated and then 2. Bundesliga club SC Paderborn. He signed a two-year contract until 2017.^[11] He played in matchday 22 to matchday 34 for a total of 13 matches.^[12]

He moved to SV Darmstadt 98 in July 2016.^[5] During the 2016–17 season, he made seven appearances.^[13] During the 2017–18 season, he made 29 appearances.^[14]

Hamburger SV

For the 2019–20 season, Heuer Fernandes moved to league competitor Hamburger SV for €1.3 million, with whom he received a contract that ran until 30 June 2022.^[15] At HSV he beat out Julian Pollersbeck to become the starting goalkeeper as part of the preparation for the season.^[16] Heuer Fernandes was rarely able to convince, however. Sports magazine kicker even wrote after the 2–3 loss in the top match against to VfB Stuttgart on 28 May 2020: "Obviously, even with the clumsy penalty committed by Daniel Heuer Fernandes in Stuttgart, it became clear that HSV had no support in goal."^[17] Up to this point, Heuer Fernandes had played 30 competitive games for HSV and had to concede 37 goals; only in 7 games had he not conceded a goal. For the next match on 31 May, Pollersbeck returned in the HSV goal, while Tom Mickel remained the backup and Heuer Fernandes was not considered for the matchday squad for the first time since his move.^[18] From matchday 30, Heuer Fernandes was given Mickel's spot as the backup.^[19] Without Fernandes in goal, HSV failed to get promoted and finished 4th in the league table at the end of the season.

Daniel Thioune took over as head coach of the team for the 2020–21 season. Under him, Heuer Fernandes was initially the starting goalkeeper again, after which Pollersbeck moved to French Ligue 1 club Lyon.^[20] The German-Portuguese keeper was the starter in the 4–1 loss in the DFB-Pokal against 3. Liga team Dynamo Dresden and in the two opening wins in the league before Mickel took over in goal. HSV then signed another goalkeeper, Sven Ulreich, who had been Manuel Neuer's backup at Bayern Munich for the past 5 years, whereupon Heuer Fernandes once again became the backup in the HSV goal.^[21]

On 1 December 2023, Heuer Fernandes scored a bizarre own goal during the Hamburg derby against FC St. Pauli. In an attempt to clear his lines following a miscued back pass from Guilherme Ramos, he inadvertently struck the ball into his own net, resulting in a 2–2 draw.^[22][23]